| 地震波在热弹性介质中的衰减性质及其相应Q值的计算方法 |
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| 引用本文： | 刘文堂,胡顺田,李军,熊仲华,赵永安.地震波在热弹性介质中的衰减性质及其相应Q值的计算方法[J].地震,2008,28(2):39-45. |
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| 作者姓名： | 刘文堂 胡顺田 李军 熊仲华 赵永安 |
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| 作者单位： | 防灾科技学院,河北,三河燕郊,065201 |
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| 基金项目： | 河北省教育厅自然科学研究指导性计划项目 |
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| 摘 要： | 该文得出热弹性介质中波的基本形式有准弹性纵波、横波和具有有限传播速度的温度波,并指出横波在传播过程中同其在完全弹性介质中一样是不衰减的,而准弹性纵波和温度波是相互伴随的、衰减的。其次,给出了具有两种不同传播速度的准弹性纵波的基本形式。最后,将地震P波看作由初始位移扰动的准弹性纵波,就固定频率和固定波长两种情况分别给出了相应Qr值的计算公式和近似公式。通常人们是利用多台的地震波资料在空间域中计算Qr值,而本文得到的时间域中Qr值的近似公式,为利用单台地震P波资料计算Qr值提供了一种方法。
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| 关 键 词： | 热弹性介质 地震波 衰减性质 Qr值 |
| 文章编号： | 1000-3274(2008)02-0039-07 |
| 修稿时间： | 2007年10月24 |
Attenuation of seismic wave in thermal elastic medium and calculation of the corresponding Qr Value |
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| LIU Wen-tang,HU Shun-tian,LI Jun,XIONG Zhong-hua,ZHAO Yon-gan.Attenuation of seismic wave in thermal elastic medium and calculation of the corresponding Qr Value[J].Earthquake,2008,28(2):39-45. |
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| Authors: | LIU Wen-tang HU Shun-tian LI Jun XIONG Zhong-hua ZHAO Yon-gan |
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| Abstract: | At first,the paper indicates that in the thermoelastic medium,the basic forms of waves include the quasi-elastic longitudinal wave,transverse wave and the wave of temperature with a finite propagate velocity.The paper also indicates that the transverse wave does not attenuate in the process of propagation as in the purely elastic medium,but the quasi-elastic longitudinal wave and the temperature wave are concomitant and attenuate.Second,the paper points out two basic forms of the quasi-elastic longitudinal wave,which has two different propagate velocity.Finally,the seismic P-wave is regarded as the quasi-elastic longitudinal wave,which is excited from the initial displacements.Both fixed frequency and wavelength are supplied with calculating and approximating formulas for relevant Qr.The approximate formula of Qr the time-region provides a method for calculating Qr value by using the seismic P-wave data from single seismic observation station. |
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| Keywords: | Thermoelastic medium Seismic wave Attenuate property Qr value |
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